Motor generator regulator system



July 7, 1936. A. L. MATTE 2,046,422

MOTOR GENERATOR REGULATOR SYSTEM Original Fild May 25, 1952 L 52 J E 60 '1 26 12km wind/174g Generator INVENTOR Patented? July 7,

UNITED? STATES BATENZIE. OEFlfiE' s umam. :5, 1932.1. Serlall No.

nivlm miiifliis 10,1936, SerlalNw.

application? March 4 (GI. 171--1l9) This inventionrelates to an improved typeofir regulatorgsystennfor controlling vthe character;-

istics of 'a dynamoelectrlc device; such for: ereample, asa motor generator, and more particue- 53 larly to meansdor preventing a;.-.substantial,vari;.--

ation in the-operation of'sucl'n a device upon:

failure of operation of a portion of the regulator? system. Thisapplication isz'azdivision of my-cmpending application Serial No.,fi13,500, filed. May 25, 1932.

The arrangements of therinvention are pan ticularly applicable in connection with multi-pfrequency generators utilized tm supply the various carrier frequencies used in voice frequency carrier telegraph. systems. It has been the practice in systems of this type; to control; the output characteristics of the generator bymeans of a tuned circuit speed regulator which operates in such a manner as to cause changes in current through an auxiliary field winding of the driving motor, thus changing its speed and: hence the generator frequency.

The tuned circuit speed regulator device utilized in illustrating the principles of the invention consists of a circuit comprising a plurality of vacuum tubes, the output of one of which supplies current directly to the auxiliary field winding of the motor. The burning' out of a tube orthe loss of plate or filament batteries in this device would reduce, the current to zero in the auxiliary field winding and might cause the motor speed to increase by several hundred R. P. M.

rmexample, eaclrtuned circuit regulator might contain four tubes and a ballast lamp and two* such devices might be involved in two-way operation over a given telegraph channel. The

failure of any of these eight tubes, ballast lamps,-

or battery supply circuits would disable all working telegraph circuits whose current supply is controlled thereby. This might involve as many as 240 carrier channels. Accordingly, the primary object of the arrangements of the invention consists in providing regulating means for the generator output of such a character that a failure of the regulator will not cause substantial variation in the operation of the generator. Other objects and features of the arrangements of the invention will appear more fully from the detailed description thereof hereinafter given. Other types of regulators than those utilizing vacuum tubes might be utilized in thearrange ments of the invention.

It will appear that the disadvantages of the regulator systems of the prior art consist in the following conditions: First, the current for the auxiliary field'iwinding of the motor, is dependent;

"upon the actual] functioning of the regulator;

second, violent, changes inthe operation of they regulatlngpmechanism, suchras might be produced:

controls the current in the auxiliary field wind- 10 ing of the motor; the setting of this rheostat remaining unaltered either upon complete failure of the, regulator, such as might ensue from the burning: out of a tube, or upon large and sudden changes; in the regulator output. In a modi- 15 fication of the arrangements of the invention the above mentioned two conditions may also be taken. care of. The general principle of the modified form of the arrangements of. the invention is to leave the regulator of the prior art in which current therefrom flows directly through the auxiliary field winding unchanged, and to add an auxiliary control circuit in: which corresponding changes in current take place whenever they occur in the auxiliary field winding. Upon a failure of the vacuum tube circuit a quick change is made from the normal control circuit to the auxiliary control circuit which includes a preadjusted rheostat.

While for purposes of illustration the invention will be described, with reference to the abovementioned combination of a vacuum tube speed regulator and a motor generator associated therewith, it will be evident that the nature of the regulating mechanism and the character of the regulation desired are not involved, nor is the nature of the regulated apparatus of consequence provided it is a dynamo-electric machine whose desired characteristic is subject to resulation by means of a current through an auxiliary field.

The invention may be more fully understood from the following description, together with the accompanying drawing, in the Figures 1 and 2 of which the invention is illustrated. Fig. 1 is a circuit diagram embodying one form of the invention. Fig. 2 is a circuit diagram showing the invention in'modified form. Similar reference characters have been utilized to denote like parts in both of the figures. I

In Fig. 1 is shown a motor I which drives the generator 2. This motor-would be provided with. the usual field winding. An auxiliary field winding 20 for controlling the speed of the motor is over the brush l1 and the resistance of an adjustable rheostat I8. The brush of the rhecstat I8 is mounted on a common shaft with the ratchet wheels I3 and I6, which may be driven, respectively, counter-clockwise or clockwise by the up anddown operation of the ratchet arms I2 and I5. These arms are actuated in this manner by the magnets II and II in combination with suitable restoring springs. The above mechanism functions to cut resistance in or out of the circuit iii of the auxiliary field winding 20 of the motor I, according to whether magnet II or II is actuated. The output of the generator 2 is connected to a tuned circuit speed regulator 3 shown in simplified form enclosed in dotted linw. 'Ihis tuned circuit speed regulator is well known in the art and may include a. plurality of vacuum tubes, such as tubes 4 and 5. The output of tube 5 is completed as follows: from the plate of tube 5, conductor 29, winding 6 of a galvanometer relay, armature and contact of relay Ill, winding of relay l0, conductor 30, through battery 30' to filament of tube 5. The output current from the timed circuit speed regulator is, therefore, impressed upon the winding 6 of the galvanometer and the winding of the relay Ill. The gaivanometer is so adjusted that when the motor speed is correct, and when the output of the regulator is at the proper level, the armature I of the galvanometer, which may be spring-biased, lies between the contacts 8 and 9. Under such conditions the magnets II and It will not be actuated. When, as a result of a change in motor speed, the current from the output of the speed regulator increases, the armature 1 establishes contact with contact 8. This will close the following circuit: from battery 3!, winding of relay 2!, conductor 53, armature 50 and contact SI of relay I0, conductor 54, armature I, contact 8, winding of magnet ll, ratchet arm l2, contact 32 to ground. This will operate the magnet Ii and will rotate the ratchet wheel l3. This will operate the brush I! to reduce the ralstance of the rheostat It included in the circuit IS with the auxiliary field winding 20 of the motor I. This about the same condition as would result from a complete failure of the tuned circuit speed regulator in the manner heretofore described.

In Fig. 2 is shown a modification of the arrangements of Fig. 1. The motor generator is connected to the tuned circuit speed regulator 3 as previously described. To control the current flowing through the auxiliary field winding 20 of the motor I, two independent circuits are pro- .vided. The first circuit is as follows: from the 10 plate of the tube 5, over conductor 33, armature 59 and contact 58 of relay l0, winding of relay I0, winding 2| of a galvanometer relay; through the auxiliary field winding 20 of the motor, to the battery 25 and ground. The battery 25 fur- 15 nishes. operating current for the plate circuit of tube 5. The second circuit is completed as follows: from the resistance of the adjustable rheo- V stat I8, brush l1, conductor. 3|, armature 56 andcontact 51 of relay [0, winding 22 of the galvanom- 20 eter relay, through the resistance 23, to battery 25 and ground. The armature, ll of the adjustable rheostat is rotated mechanically by the driving ratchet wheels l3 and iii in the manner heretofore described. The resistance 23 simulates in electrical characteristics the auxiliary field winding 20. As heretofore pointed out in the two independent circuits previously traced are included, respectively, the windings 2! and 22 of a differentially wound spring-controlled galvanometer 3 relay. The currents through resistance 23 and auxiliary field winding 20 pass through the differentially arranged windings 22 and 2H in such a manner that when the operation of the speed regulator is normal the currents through these 35 windings are equal and opposite in effect and the armature 1 will stand between the contacts 8 and Q. Any change in the current through the auxiliary field winding 20 due to the operation of the speed regulator will cause the armature I to make contact either with contact 8 or contact 9, which in the manner heretofore described, will operate the ratchet wheels I 3 and i6 and cause the rheostat I8 to operate to change the current through the resistance 23 until it is again essen- 45 will reduce the speed oi. the motor and of the tially equal to the current in the auxiliary field generator. Conversely, if the currentin the output circuit of the tuned speed regulator is reduced, the armature I will close the contact 9. This will operate the magnet l4 and cause the ratchet wheel IE to rotate in a clockwise direction. This, in turn. will operate the brush II to increase the resistance provided by the rheostat I8 in the circuit of the auxiliary field winding 2|. This will tend to increase the speed of the motor and the generator.

If the output from the timed circuit speedregulator should fail completely for any reason, such as the failure of one of the tubes, the relay II would become deenergized and would remain deenergized until the switch 28 was operated and the output current 01' the timed circuit speed regulator restored. The deenn oi. relay ill will open at its lower contact and armature the circuit previously traced from the battery 3| for themagnets II and IQ. Thiswill leave thewrheostat I8 on its last legitimate setting. The deenerglzationofrelayll-wlllalaooperateanalarm 2i.

If the output current from the tuned circuit speed regulator does not cease but changessharplyupordownsoastoremnrethe repeated operation of either II or II, the slowoperating relay 2! will operate. This will shortclrcuittheoutputcircuitoiflietubelandbring 'winding 20 and opposite in effect thereto due to the dilferential arrangement of said windings. When this occurs, the armature i will come to rest again between the two contacts 8 and 9. In this manner an auxiliary circuit is provided which always has going through it a current of the same value as the current which flows through the auxiliary field winding 20 and is required at that'moment to maintain the generator at its correct speed.

In the event of failure of current from the tuned circuit speed regulator, the relay Ill will become deenergized. The armature 56 and contact 55 of relay I immediately transfer the circuit including'the auxiliary field winding 20 to the conductor 34 and the adjustable rheostat l8.

At the same time the middle armature disconnects winding 20 from regulator}. .The armature SI of relay I. opens the circuit from the bat- .teryiLoverthearmature'lto themagnets II and I4. This will stop any operation of the ratchet wheels l3 and ltandwillbringthearmofthe rheostat to a standstill; Simultaneously, the alarm 28 will beoperated over armature I and 70 contact 62 ofrelay II. The motor generatorthen continuestorunatthespeeddeterminedbythe 'last setting of the adjustable rheostat ll. It the current from the tuned circuit speed regulator oompletelycease but chimges sharplyup or down so as to cause either magnet l I or magnet I 4 to operate repeatedly in quick succession, the slow-operating relay 2'! will operate due to the condenser short-circuiting it and short-circuit the winding of relay l and cause it to release. This will initiate the same train of operation as ensues upon a complete failure of the tube of the tuned circuit speed regulator. To restore operation when 3 has been fixed, armatures of i0 may gggristored by hand or by a device like 28 in While the invention has beendisclosed as embodied in certain specific forms which are deemed desirable, it is to be understood that it is capable of embodiment in other and widely varied forms without departing from the spirit of the invention as disclosed in the appended claims.

What is claimed is:

1. A motor generator control system comprising a motor and generator operated thereby, a vacuum tube regulator connected to the output of said generator, an auxiliary field winding for said motor, a first circuit for connecting said auxiliary field winding to the output of said vacuum tube regulator, a second circuit in which the current fiow is adapted to simultaneously simulate the current fiow in said first circuit, and means responsive to a cessation of current fiow in said first circuit for connecting said auxiliary field winding in said second circuit.

2. A motor generator control system comprising a motor and generator operated thereby, a vacuum tube regulator connected to the output of said generator, an auxiliary field winding for said motor, a first circuit for connecting said auxiliary field winding to the output of said vacuum tube regulator, a second circuit including acurrent regulating device, a galvanometer controlled by the current fiow in said first and second circuits, switching means controlled by said galvanometer for operating said current regulating device, and means in said first circuit operative upon a failure of current flow therein for connecting said auxiliary field winding to said second circuit. I

3. A motor generator control system comprising a motor and generator operated thereby, a vacuum tube regulator connected to the output ofsaid generator, an auxiliary field winding for said motor, a first circuit for connecting said auxiliary field winding to the output of said vacuum tube regulator, a second circuit including a current regulating device, a galvanometer controlled by the current flow in said first and second circuits, switching means controlled bysaid galvan'ometer for operating said current regulating device, a relay, means for completing said first circuit through the winding and over a contact of said relay when operated, and means operative upon the release of said relay for connecting said auxiliary field winding to said second circuit.

4. A motor generator control system comprising a'motor and generator operated thereby, a vacuum tube regulator connected to the output of said generator, an auxiliary field winding for said motor, a first circuit for connecting said. auxiliary field winding to the output of said vacuum tube regulator, a second circuit including a current regulating device, .a galvanometer controlled by the current flow in said first and second circuits, switching means controlled by said galvanometer'for operating said current regulating-device, a relay, means for completing said first circuit through the winding and over the contact of said relay when operated, means operative upon the release of said relay for connecting said auxiliary field winding to said second circuit, and a second relay responsive to sudden variations in current in saidfirst circuit for deenergizing said first mentioned relay.

ANDREW LEWIS MATTE. 

